Heater



FIG. 1 is a perspective view of a heater with a cylindrical glass tube inside the shield guards;

FIG. 2 is a front view of the heater with a cylindrical glass tube inside the shield guards;

FIG. 3 is a front view of the heater with a cylindrical glass tube inside the shield guards and with its door open;

FIG. 4 is a first side view of the heater with a cylindrical glass tube inside the shield guards;

FIG. 5 is a rear view of the heater with a cylindrical glass tube inside the shield guards;

FIG. 6 is a second side view of heater with a cylindrical glass tube inside the shield guards;

FIG. 7 is a top view of the heater; and,

FIG. 8 is a bottom view of the heater. 

CLAIM The ornamental design for a heater, as shown and described. 